Pete Hopkins

News

Josephson Arbitrary Waveform Synthesizer

NIST Increases the Speed of Superconducting Circuits by Advancing Josephson Junction Barrier Technology

May 1, 2023

On May 1, 2023, NIST researchers published a paper titled: “ Nb/a-Si/Nb Josephson junctions for high-density superconducting circuits” by David Olaya, John

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Publications

Effects of Non-Sinusoidal Current PhaseRelationships on Single Flux Quantum Circuits

March 1, 2024

Author(s)

Miranda Thompson, Manuel Castellanos Beltran, Pete Hopkins, Paul Dresselhaus, Samuel Benz

While the relationship between current and phase in a Josephson junction is canonically assumed to be sinusoidal, both the materials of the electrodes and the

Josephson Sampler Response using a Binary Search Algorithm

January 19, 2024

Author(s)

BART VAN ZEGHBROECK, Logan Howe, Pete Hopkins

This paper presents the use of a binary search algorithm to obtain the simulated response of a superconducting Josephson junction-based sampler. In the absence

Single Flux Quantum-Based Digital Control of Superconducting Qubits in a Multi-Chip Module

June 24, 2023

Author(s)

Chuanhong Liu, Robert McDermott, Britton Plourde, Andrew Ballard, Jonathan DuBois, Pete Hopkins, David Olaya, John Biesecker, Samuel P. Benz, Dan Schmidt, Joel Ullom

The single flux quantum (SFQ) digital superconducting logic family has been proposed as a practical approach for controlling next-generation superconducting

Systematic Improvements in Transmon Qubit Coherence enabled by Niobium Surface Encapsulation

June 14, 2023

Author(s)

Mustafa BAL, Akshay Murthy, Francesco Crisa, Shaojiang Zhu, Florent Lecocq, Joe Aumentado, Joel Ullom, Pete Hopkins

We present a novel transmon qubit fabrication technique that yields systematic improvements in T1 coherence times. In this study, the devices are fabricated

Coherence-limited digital control of a superconducting qubit using a Josephson pulse generator at 3 K

May 8, 2023

Author(s)

Manuel Castellanos Beltran, Adam Sirois, Logan Howe, David Olaya, John Biesecker, Samuel P. Benz, Pete Hopkins

Compared to traditional semiconductor control electronics (TSCE) located at room temperature, cryogenic single flux quantum (SFQ) electronics can provide qubit

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Patents (2018-Present)

Superconducting Waveform Synthesizer

NIST Inventors

Samuel P. Benz , Manuel Castellanos Beltran , Paul Dresselhaus and Pete Hopkins

A superconducting waveform synthesizer produces an arbitrary waveform and includes an encoder that produces a bitstream; a pattern generator that produces a current bias pulse from the bitstream; a Josephson junction that produces a quantized output pulse from the current bias pulse; and a converter

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Pete Hopkins (Fed)

News

Publications

Patents (2018-Present)